AA Battery pack holder with slots for contacts and wire holes
by adgaudio, published
Openscad code for this and other battery holders is available on github:
Can be wired in series or parallel, or even just used to store 4 AA batteries together. The contacts fit in a slot that can extend to 2 batteries :)
There is a nut trap through the center designed to fit m3 bolts and nuts, if you'd like to secure the batteries onto the contacts.
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I hope you print one!